The best way to learn full functionality is to try different things yourself and see how things work. You can always refer to documentation and forum to see examples and use cases. We are trying to constantly update documentation and answer all the questions on the forum, so there is a lot of material here.
Unfortunately, there is no training course or something like this available at the moment. But if you need to get something to work, you can always ask us.
The advanced functionality is very robust and extensive, and while there are still limitations, even we do not know of its full potential and often experiment to fulfill customers’ requests. Simply because there are use cases we didn’t foresee, but which are still possible to achieve using Advanced tab.